Attachment for band saws



G. H. WALLACE.

ATTACHMENT FOR BAND SAWS.

APPLICATION FILED MAY 7. 1920,

Z 47 JJ ZZ my Z5 ATTACHMENT FOR BAND SAWS.

Massese.

Speccation'of Letters Patent.

carentes aaa.' sa, was.

Application filed 'May-7, 1920. Serial No.v 379,512.

To ,all whom t may concern.'

Be it known that l, GEORGE lil.. VALLACF., a citizen of the United States, residing at Cambridge, in the county of' Middlesex and State of Massachusetts, have invented new and useful Improvements in Attachments for Eand Saws, of which the following is a specification.

vThis invention relates to an attachment for band saw machines.

ln using band saw machines, it has been customary, especially if'the piece to be cut out is of irregular form, to first mark out the desired finished shape upon a piece of wood to be saived,and to then cut the lpiece out by the pattern marked thereon. In other cases where irregular shaped pieces are to be produced, the work is first marked out on the piece of 'wood to be eut, and the'piece is then cut out to finished shape by a moulding,` machine.

It is the object of this invention to provide an attachment fora band saw machine which eliminates 'the work of laying` out the pattern on the wood and of cutting out the finished piece on a moulding machine, the work being` done directly by the band saw machine, thus saving a large amount of time and expense.

lt is also an object of the invention to so construct the device that the same may be easily adapted to position the piece of wood relatively to the worlr guide and saw blade in accordance with the requirements ofthe variously shaped pieces of wood which it is desired to produce.

The invention consists in the combination and arrangement of parts set :forth in the following specification and particularly pointed out in the claims thereof.

Referringto the drawings:

Figure 1 is a plan view of my improved attachment for a band saw machine, illustratingq` the manner of using the device in sawing' out elliptical shaped pieces of material.

Fig. 2 is a sectional elevation taken on the line 2--2 of Fig 1.

Fig. 3 is a transverse sectional elevation taken on the line 3-3 of Fig. 1.

Fig. Llis a plan view of the portion of the device adjacent to the work guide, illustratingr the manner of using the device in sawing` out circular pieces of material.

Fig. 5 is a plan view similar to Fig. 4e

illustrating the method of sawing irregular shaped pieces of material.

Like numerals referto like parts throughout the several views of the drawings.

in the drawings-5 is aportion of the table of a band saw machine, and 6 is aga-ide frame embodying my invention, and consisting of a member 7 and another member 8 slidable transversely of the member-7 in aguidewa-y 9 provided in said member Zand extending` transversely thereacross at right angles thereto. j

The member 8 is clamped to the member 7 by a clamp bolt 10 and thumb nut 11. The member 8 is provided with a slot 12 extending longitudinally Athereof through which the bolt 10 projects so that by loosening the thumb nut 11, the member 8 can be slid along` transversely of and upon the member 7 in the guideway A9 to any desired position, and then clamped firmly thereto by tightening` the thumb nut 11. .ln order to `render the device light and cheap to manufacture, `the members 7 and 8` are preferably formed of flat strips of material.

Upon the outer end of the member v8 a guide block 13 is fastened, said guide block being,` detachably fastened thereto by means of screws 14. Said guide block 13 has a conveXly curved guide plate 15 fastened thereto which extends across one edge of a notch 16, said notch 16 and guide plate 15 forming a closed slot through which a band saw 17 passes. The cutting; edge 18 ofthe band saw is preferably in alignment with the center line A of the member 8.

A piece of material 19 from which the finished piece is to be cut has temporarily fastened thereto by pins 2() a templet 21, the edge 22' of which is adapted to engage the guide vplate 15.

The guide frame 6 as a whole can be raised and lowered to accommodate different thicknesses of material to be cut by means of screw threaded studs 23 which are clamped to the band saw table 5 by nuts 24 and 25 and collars 26 and 27. The screw Athreaded studs-23 extends through slots 28 in the member 7, and said mem-ber 7 is clamped to the studs 23 by means of nuts 29 and 30, and collars 31 and 32. The studs thus constitute standards or supports proiecting' upwardly from the band saw table 5, upon which the guide frame 6 is supported. By adjusting the nuts 29 and 30 upwardly or downwardly upon the studs 23, the distance between the guide :trame member 8 and the top of the table 5 may be varied toaccommodate different thicknesses of material to be cut. j y

Formed in the upper surfaces ot the member 8 is a groove 33 in which a block 34 is adapted to slide and be clamped by a bolt 35, collar 36 and nut 37, the said bolt passing through the slot l2 previously described. A plate 38 is pivoted upon a shouldered portion 89 of the nut 37, being attached to the block 34 by said nut, and said bolt, and thereby being moved longitudinally of the member 8, togetherl with the block 34. The plate38 rests upon the upper surfaces ot the member `8 and theguide block 13. A slide 40 is mounted to slide longitudinally upon-the upper surface of the plate 38, being guided by members 4l and 42, which are fastened to the upper surface of said plate. A spring 48, one end of which is fastened to a screw 44, carried by the plate 38,'and the other end fastened to the slide 40- norvmally ytends to pull a shoulder 45 formed upon said slide against the guide member 4l.

Aguide pin 46 which is also adaptable for use asa centering pin, is located in the outer end of the slide 40, and projects downwardly therefrom, being provided Vwith a pointed lower end 47. The guide pinv 46 is normally located in alignment'with the ccnter line A of `the member 8, being held in said positionby aV spring 48, lone end ol' which is attached to the plate 38 and the other end being attached to an arm 49 which extends outwardly from the guide block i8. The guide member 42 is provided with an extension which terminates in a downwardly projecting larm 50, through which extends an adjusting screw 51 adapted to engage the edge oit the member 8'as illustrated in Fig. The adjusting screw 5l constitutes a stop to position the guide pin 46 upon the center line A, the spring 48 always tending to hold the adjusting screw 5l against the edge of the member 8. A lock nut 52 is provided to prevent the adjusting screw 5l from becoming loosened in the arm 50. The slide 40 may be adjusted longitudinally ot' the plate 38 to position the guide pin 46 relativelyto the guide plate 'l5 'and 'saw blade 17, and when correctly positioned maybe securely held in said position by `a screw 58 which is located in the guide member 4l and contacts with the upper I surface of said slide. The slide 40 is provided with a suitable handle 54, by which it may be manipulated.

The device herein illust-rated and described is adapted to be used in al different manner when sawing out different shaped pieces of material. In Figs. l and 2 the templet 21 is approximately elliptical in torni, and isy provided with a slot 55 eX- ythe guide pin 46 projects. In this iorm the slide 40 yieldingly holds the templet 2l against the guide plate l5.

In Fig. 4a square piece of material 56 is illustrated trom which it is intended to saw a circular piece of wood. In this form the templet is dispensed with, and the pin 46 constitutes a centering pin.

in F ig. 5 a rectangular piece of material 57 is illustrated Vfrom which it is intended to saw an irregular piece oit wood. In this form a templet is provided, having a working edge againstwhich the guide pin 46 is adapted to contact.

'lhe general operation oir the device hereinbelorc specifically described is as follows: The member 7, together with the parts supported thereon, is fastened to the work table 5 of the band saw machine by means `Soif the studs 23, nuts 24 and 25, and collars 26 and 27. lt it is desired to adjust the guide frame vertically to make a greater or less space between the guide frame and the top of the table 5, this is accomplished by means of thev nuts'29 and 30 upon the studs 23. The member 8, together with the guide block 13, can be moved toward or away from the member 7 by means of the bolt l0 and thumb nut 1l.

The guide frame as a whole can be moved laterally of the saw i7 in order to accommodate different widths ot saws and still have the cutting edge of the saw in alignment with the .center line A oi the member 8 by loosening the nuts 29 and moving the member 7 'longitudinally thereof, at which time the studs 23l will move vin the slots 28, and then clamping the inen'iberstogether again by tightening'the thumb-nut 29.

lli it is desired to saw pieces which are substantially elliptical in torni as illustrated in l, the piece ot' material i9 trom which the desired object is to be sawed, has a templet 2l attached thereto which is of the contour ot the piece to be sawed, less the distance Jfrom the 'front edge of the guide plate l5 to the front edge ot the saw i7. 'lhe plate 38 with the slide 40 thereon -is rst positioned upon the member 8, the said position being determined by the size of the piece ot material to be sawed, and the plate is then iirmly Iclamped to the member 8 byv the bolt 85, collar 86 and nut 37, while the slide 40 is 'free to slide upon the plate as the screw 5? does not engage said slide. The material i9 is then placed upon the band saw work table 5 in approximately the position illustrated in dotted lines Fig. l. The

handle 54 is then grasped and the slide 40r and plate 88 simultaneously moved against the action of the spring 48 .to their dotted line position in Fig. l, and the pin 46 is located in the slot 55 of the tempiet 2l. The material is then moved into engagement llO with the saw blade 17 beingguided at first by the operator until the templet engages the guide plate l5 as illustrated in full lines Fig. l, aiter which the said material is ted by the operator to saw around the templet 2l. upon the dotted line B, the` said templet being` at all times yieldingly held against the guide plate l5 by the action ot the spring 43. At the completion ot t-he operation, the templet f2.1 which has been temporarily attached by the pins 2O to the material 19 during the operation hereinbetore described is removed and the said operation is repeated with the same templet to produce another like-shaped article.

When sawing circular pieces as indicated by the dotted line C, Fig. 4, the slide 40 is adjusted to so locate the pin 46 that the distance between said pin and the saw blade 17 Will constitute theradius of the piece to be sawed, and the slide is then secured in said position upon vthe plate 38 by tightening the screw 53 against theslide 40 and thereby clamping said slide and plate together. ln starting the operation, the various parts are all positioned in approximately the same position as illustrated in dotted lines in Fig. l. In this lorm, however, the use oi a templet is dispensed with, and the point 47 of the pin 46 is caused to penetrate the material 56 and act as a center upon Which the said material may rotate. The material 56 is brought into engagement with the saw blade 17 in the same manner as previously described in connection with Fig. l and after having reached the position illustrated in Fig. 4, it is only necessary to rotate the material 56 with the pin 46 as a center thereby sawing` the material upon the dotted 'line C.

ln sawing; irregular shaped pieces as illustrated in Fig. 5, a templet 58 is utilized but the guide plate l5 is dispensed with and in its place the pin 46 constitutes the guide. In such cases it is preferable to remove the guide plate l5 and move the member 8 upon the member 7 a sutlicient distance to remove the saw blade from the slot 16 in. order that the Q'uide block 13 and guide plate l5 will not interfere with the pin 46. ln starting the operation, the mate-rial 57 is ted by the operator into engagement With the saw blade which will cut through said material as indicated at (Z, Fig. 5, until the pin 46 engages the edge 59 of the templet 58. and thereafter the material is ted by the operator With he edge ot the templet engaging the pin 46, thereby sawing the material upon the dotted line D as indicated in Fig.

By the use o1 this attachment tor a band saw, very accurate Worlr may be obtained with grreat speed.

Having thus described my invention. what l. claim and desire by Letters Patent to secure is: I

l. 'An attachment for band saw machines having, in combination, a guide frame provided with a slot tor a band saw, means to tasten said guide Yframe to the work table of said band saw machine, a guide plate for a piece of material on said guide frame, and means to yieldingly position the piece oit material relatively to said guide plate.

2. An attachment for band saw machines having, in combination, a guide trame provided With a slot tor a band saw, means to 'fasten said guide trame to the Work table of said band saw machine, a guide plate for a piece of material on said guide trame, means to yieldingly position the piece oi material relatively to said guide plate, and means to adjust said guide Jframe vertically relatively to said Work table.

3. Ain attachment for band savv machines having, in combination, a guide trame provided ivith a slot Jfor a band sani, means to tasten said guide 'trame to the Work table ot said band saw machine, a `guide plate 'for a piece ot material on. said guide trame, means to yieldingly position the piece of material relatively to said guide plate, and means to adjust said guide trame laterally with relation to said band saw.

4. r-ln attachment for band saw machines having', in combination, a guidev frame provided Witha slot for a band saw and a `guide plate having a curved guiding` edge adjacent to said band saw, and adapted to be engaged by a piece of material to position the same to be cut by said band saw, and means to yieldingly position the piece oi material relatively to said guide plate.

5. An attachment tor band sav.T machines having, in combination, a guide .trame provided ivith a slot for a band san', means to 'tasten said guide frame to the Worlr table of said band saw machine, a guide plate vtor a piece of material on. said guide trame, a plate mounted to slide upon said guide trame and means slidably mounted upon said plate provided with means adapted to engage a piece ott material and yieldingly hold/said material against said guide plate. 6. An attachment tor 'band saw machines `having, in combination, a guide frame provided with a slot for a band saiv, means to `tasten said guide frame to the Werl; table ot said band saw machine, a guide plate 'tor a piece ot material on said guide trame. a plate mounted to slide upon said guide frame and pivotally attached `tiereto, and means slidably mounted upon said plate provided with means adapted to engage a piece ot materialand'yieldingly hold said material against said guide plate.

7. An attachment for band saw machines having, in combination, a guide trame provided vvith a slot for a band saw, means to :tasten said guide trame to the Work table oit said band saw machine, a guide plate for,

a piece of material on said guide trame, a plate y mounted to slide upon said guide iframe, means to simultaneously position and pivotally attach said plate to said guide trame, and 'means slidably mounted upon saidrplate provided with means adapted. to engagea piece of material and yieldingly hold said material against said guide plate.

8. An attachment 'for band saiv machines having, in combination, a guide 'irame, means to fasten said guide trame to the vvorlt table cfa band saw machine, a guide block detachably fastened to said guide frame and provided with anotch in one edge thereof to permit the passage ot a band saiv therethrough, a guide .plate Jfastened to said block extending across said notch and constituting' a guide member 'for a piece ot material to position the saine to be cutby said saw,-and means to yieldinsflv hold said piece oit material against said guide plate.

9 An attachment ior bandsaw machines having, in combination, a guide traine, means to 'tasten said guide iframe to the work table of abaiid saivmachine, a guide block detachably fastened to said guide traine and provided with a notch in one edge thereof to permit thepassage of' a band saw therethrough, a convexlyxcurved guide plate fastened to said blockA extending across said notch and constituting` a guide member'tor a piece of material to position the same to be cut by said saw, and means to yieldingly hold said piece olf material against said guide plate;

l0. An attachment tor band saw machines having, in combination, a guide trame consistingoi two fiat strips, one slidable uponA the other in a direction at right angles thereto, means to clamp said slidable strip to the other strip, means to clamp said guide trame to the Work tabler ot' a band saw iiiachine yat varying distances thereabove, a guide plate for a piece ot material on said first named strip, and means mounted upon said lirst' named strip adaptedl to hold said piece ot material against said guide plate.

ll. An attachment for band saw machines having, in combination, a guide trame consisting of tivo flat strips, one slidable upon the other in a direction at right angles thereto, .means tov clamp said slidable strip to the other strip, means to vclamp said 'guide trame to the work table oil said band saw machine, said mentioned strip being provided ivith a slot in one end thereot to `enable a band saw to pass therethrough, one

edge of said iirst named strip adjacent to said'slot being provided with a guide plate adapted to guide a piece oi material to position the tofbe cut by said saw, and means mounted upon said first named strip adapted to4 holdk said piece'oi. material against said guide plate.

12. An attachment for band saw machines having, in combination, a guide frame consisting ot two dat strips,.one slidable upon the other in a directionat right angles thereto, means to clamp saidvslidable strip to said slot being provided with a guide plate adapted to guide a piece of material to position the same to be cut by said saw, a` plate pivotally mounted upon said first namedl strip,and a member adapted to slide upon said plate and yieldingly hold said piece ot material against said guide plate.

i3. .it-.n attachment for band saw machines having, in combination, a guide trame con- ,Listing ot two flatstrips, one slidable upon the other in a direction at right angles thereto, means to clamp said slidable Ystrip to the outer strip, means to clamp said guide :trame to the work table ot said vband saw machine, said First mentioned strip being provided with a slot in one end thereof to enable a bandsaw to pass therethrough, on, edge oit said'i'irst named strip adjacent .to said. slot vbeing provided with a guide plate adapted ,to guide a piece ot' material to position the same to be cut by saidsaw, a plate pivotally mounted upon said iirst named strip, a slide `upon said plate and a pin located in said slide adapted to engage said'piece of material and co-operat@J with said slide to yieldi ngly hold said material against said guide plateu i la. An attachment lfor band saw machines liaviiugj, in combinationy, a guide trame consisting` ot two tlat strips, one slidable upon the otherr in. a direction at right angles thereto, means to clamp said slidable strip t0 the other strip, means to clamp said guide traine to the work table oit' Said band saw machine, said iirst mentioned strip being provided with a slot in one endthereof to .enable a band saw to pass therethrough, .one edge ot said first named strip adjacent to said slot beine' provided With a cuide r l ra plate adapted to guide a piece of material i to position the same to be cut by said saw, a plate pivotally mounted upon saidl iirst named strip, a slide upon said plate, a pin located in said slide, and means to position said pin relatively tothe cutting edge of said saw.

l5. An attachment for band saw machines having, in combination, a guide trame consisting ot tivo flat strips, one slidable upon the other in a direction at right angles thereto, means to clamp said slidable strip to the other strip, means to clamp said guide traine to the Work table of said band saw machine, said first mentioned strip being provided with a slot in one end thereof to enable a and means to position said guide pin relatively to the cutting edge of Suid saw.

in testimony whereoie l have hereunto .set my hand in the presence of two subscribing: Witnesses.

GEORGE H. WALLACE. wWitnesses FRANKLIN E. LOW, JOHN B. RICHARDSON. 

